Bret Michaels -- 'Setback' in Recovery Process

4/27/2010 7:31 PM PDT

Bret Michaels -- 'Setback' in Recovery Process

Bret Michaels' reps confirm that the rocker suffered a "setback" in his recovery from a brain hemorrhage -- and he may now be at risk for seizures.

According to Bret's people -- test results show Bret is experiencing hyponatremia, a side effect from the subarachnoid hemorrhage which is caused by a lack of sodium in the body. The condition can often lead to seizures.

But despite the setback, doctors are still hopeful Bret will gradually improve, "as the blood surrounding the brain dissolves and is reabsorbed into his system, which can be a very painful recovery and take several weeks to months."

Bret's reps also report that the rocker "remains under 24-hour observation in the ICU and is in positive spirits. He is responding well to tests and treatments."

Bret was first hospitalized for the hemorrhage last Thursday night after complaining of a massive headache.